After run CSSAN I am trying to run csalter.plb, but this problem occur:

SQL> @c:\oracle\product\10.2.0\db_1\RDBMS\ADMIN\csalter.plb
+0 vytvorenych riadkov.+Funkcia vytvorena.Funkcia vytvorena.Procedura vytvorena.This script will update the content of the Oracle Data Dictionary.Please ensure you have a full backup before initiating this procedure.Would you like to proceed (Y/N)?ystary 6: if (UPPER('&conf') <> 'Y') thennovy 6: if (UPPER('y') <> 'Y') thenChecking data validility...Sorry only one session is allowed to run this script*Procedura PL/SQL skoncila uspesne.Checking or Converting phrase did not finish successfullyNo database (national) character set will be alteredCSALTER finished unsuccessfully.Procedura PL/SQL skoncila uspesne.
+0 zrusenych riadkov.+Funkcia zrusena.Funkcia zrusena.Procedura zrusena.

I started dabase with startup restrict and then try to run csalter.plb but the result is the same..

Please help, I try to use search but without success. Thank you for any idea.

I try to migrate data from to win1252 to utf8... I run csscan and have some lossy and trunction data so I couldnt do export/import... So I try to run csalter.plb and everything going ok, i set database to restrict mode and run csalter but this problem occur, I try to look at v$session and kill every session here, but when I again run csalter, error ocur again, so I do not know what to, if you have any idea pls share it, I also try to search this issue on forum, but without any success...